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本文对雕塑形式的创新的利与弊给予分析,同时又对造成这一现象追溯根源。雕塑家一方面希望创造真正有价值的原创作品,但往往感到身不由己,为了顺应这个社会潮流,不得不对自己进行包装炒作,不得不跟着评论家,画商的指挥棒转,同时又感到痛失自我,丢失了自己内心的创作需求,这种现象是思索和顺应潮流的结果,是十分无奈的,值得思考。 相似文献
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This paper considers a novel polling system with two classes of message which can experience an upper bounded time before being served. The station serves these two classes with mixed service discipline, one class with exhaustive service discipline, and the other with gated service discipline. Using iterative method, we have developed an approximation method to obtain the mean waiting time for each message class. The performance of approximation has been compared with the simulation results. The expression for the upper bound of waiting time is given too. 相似文献
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By modifying the IEEE 802.11 wireless local area network (WLAN) medium access protocol (MAC), a contention based and a polling based protocol are proposed to deal with the case every station possesses two classes of frame in real time applications. Both protocols can ensure the real time frame only need to wait a determinable bounded time. These two protocols are introduced briefly and a performance comparison between them is made. Simulation results show that each protocol has advantage over the others in certain network condition. 相似文献
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晶体管集电结电容C_b′c在放大电路中引入一内部反馈,阻容耦合放大时,这个内部反馈是一个电压并联负反馈,反馈系数小,可忽略不计。当放大器的负载为电感性时,通过C_b′c的反馈为电压并联正反馈,从而产生自激振荡。本文通过计算和实验两个方面加以证明。 相似文献
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